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A survival analysis of the approval of US patent applications.
- Source :
- Applied Economics; 2011, Vol. 43 Issue 11, p1375-1384, 10p, 3 Charts, 4 Graphs
- Publication Year :
- 2011
-
Abstract
- We model the length of time that it takes for a patent application to be granted by the US Patent and Trademark Office (USPTO), conditional on the patent actually being awarded eventually. Survival analysis is applied and both the nonparametric Kaplan-Meier and parametric accelerated failure time models are used to analyse the data. We find that the number of claims a patent makes, the number of citations a patent makes, the patent's technological category, and the type of applicant all have significant effects on the duration that a patent is under consideration. A log-normal survival model is the preferred parametric specification, and the results suggest that the hazard function is nonmonotonic over time. [ABSTRACT FROM AUTHOR]
- Subjects :
- PATENT law
FAILURE time data analysis
INTELLECTUAL property
Subjects
Details
- Language :
- English
- ISSN :
- 00036846
- Volume :
- 43
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Applied Economics
- Publication Type :
- Academic Journal
- Accession number :
- 60122808
- Full Text :
- https://doi.org/10.1080/00036840802600418